Tool



M. E. MITCHELL ET AL TOOL Aug. 31, 1937.

Original Filed Feb. 2, 1935 FllT-i l F l I; :El

INVENTORS M4160; Mt. M/fC/ffli Pin-e 5. MOPTf/Vff/V W ATTORNEY.

Patented Aug, 31, 1937 PATENT OFFIQE TOOL Malcolm E. Mitchell,

Hollywood, and Peter E. Mortensen and Harold W. Fowler, Oakland,

Calif.; said Mitchell assignor to said Mortensen and said FowlerOriginal application February 2, 1935, Serial No.

4,712, which in turn is a division of application Serial No. 720,760,April 16, 1934. Divided and this application Dece 115,564

Claims.

The invention relates to means for manufacturing a part of a couplingsuch as used to readily attach and detach sections or extensions offluid circuits as air pressure systems and the like.

5 More particularly the present invention relates to a tool for forminga special part of a new and improved coupling invented by ourselves. Themethod of constructing this coupling has been set forth and claimed inour copending application Serial Number 4712 filed February 2, 1935, and

the present case is a divisional application which in turn is a divisionof application Serial No. 720,-

760 filed April 16, 1934, of said copending application.

The coupling in the construction of which the tool of the presentinvention is used, is formed in a manner concealing the means ofattachment of a pair of coupling sections whereby the surreptitiousremoval of any portion of the fluid cir- 00 cuits with which thecoupling is used is made substantially impossible without the detectionby the attendant in charge of the apparatus. To

accomplish this concealed means of attachment, the coupling utilizes asection having a certain inside construction and it is an object of the8 present invention to provide a tool for making this constructionpossible.

The invention possesses other objects and features of advantage, some ofwhich, with the foregoing, will be set forth in the followingdescription of the preferred form of the invention which is illustratedin the drawing accompanying and forming part of the specification. It isto be understood, however, that variations in the show- 35 ing made bythe said drawing and. description may be adopted within the scope of theinvention as set forth in the claims.

Referring to said drawing:

Figure 1 is a longitudinal sectional view of a 40 coupling constructedin accordance with our invention with the separate sections thereofattached.

Figure 2 is a transverse sectional view of the coupling and is taken onthe plane of line 22 of Figure 1. 1

Figure 3 is a side elevation shown partly in section of a toolconstructed in accordance with the present invention and shownoperatively as- 50 sociated with a tool and coupling section supportingmeans.

Figure 4 is a transverse sectional view of the tool and is takensubstantially on the plane of 'the line 4-4 of Figure 3.

55 Figure 5 is a View similar to Figure 3 but showmber 12, 1936, SerialNo.

ing the engagement of section.

Figure 6 is an elevational view of a reamer adapted to complete theforming operation of the coupling section. 5

With reference to the accompanying drawing, the coupling in theformation of which the present tool is used is illustrated in Figures 1and 2. The coupling is composed of detachable male and female sections12 and i3 which are arranged for telescopic engagement at their ends I 4and I6 and are preferably threaded at their opposite ends I! and 18 tofacilitate the connection of the sections to a fluid line. Extendinglongitudinally through the sections are aligned l9 and 2! for conveyingfluid through the coupling. Means for sealing the sectionsv againstleakage when coupled, here comprises a packing washer 22 which ismounted in the bore and arranged to engage about the end I4 of the male0 member, the latter being preferably formed with a slight taper toafford a wedged engagement with the Washer. The washer further serveswith the members detached as a seat for a valve 23 which is mounted foraxial movement in the bore 2| and is normally urged by a spring 24 toseat against the washer in passage closing position and is displaceablefrom such position only by and upon insertion of the male end l4 throughthe washer. n

The connection between the detachable sections'is of a so-called bayonettype, a plurality of bayonet slot portions 3| being formed within thebore 2| at the end l6 of the female section and a plurality of slotengaging lugs or projections 32 are formed on the interfitting end I4 ofthe male section. The containing of the slot the bore 2| of the femalesection entirely conceals the means of attachment when the sections areattached. The slots 3! extend from the open end of the bore 2| inwardlyto an enlargement 33 in the bore so that defined at the inner ends ofthe slots is an annular shoulder 31 behind which the lugs may be lockedon movement of the lugs through the slots and rotated away from theinner end of the slots. Retention of the projections in this latterposition is here effected by a plurality of sockets 38 formed in theshoulder and arranged to receive and interlock with the projections.Since the insertion of the male section is resisted jointly by thespring 24 and the fluid flow, the resisting force will be effective topress the projections against the shoulder when the same are engaged andinto the sockets with the result that a positive lock- 55 the tool inthe coupling ing of the parts will be insured. As an important featureof the coupling and serving to prevent twisting of the projections fromthe sockets, the projections and sockets are both formed of rectangularsection so that the same will squarely abut each other when engaged andno incline is available on the interengaged sides thereof for permittinga longitudinal disengaging movement incident to a forceful twisting ofthe projections and sockets.

In couplings previous to the one above described it has been thepractice of providing bayonet guide portions such as the grooves 3| hereshown by cutting longitudinal slots through the female section whichslots extend completely through and to the outside'of the section sidewalls, and to provide the offset or locking portions of the slot bymerely cutting sidewise from the inner end of the slot or by drillingthe sec- 0 tions at aportion contiguous with the inner ends of theslots. Since the operations entailed in forming these previousconstructions are well known and commonly used in machine shop practice,the manufacture of the female section of the coupling presented noparticular difficulty. In the coupling abovedescribed, however, where inthe guide portions 3| and the sockets 38 are formed entirely within thebore 2| of the casing 25 and are completely inaccessible for forming by0 the usual apparatus found in the machine shops,

5 larly devised to provided on the manufacture of the female section ofthe coupling has required the development of a special tool and methodfor its formation. The tool of the present invention has beenparticuprovide for the formation of the bayonet slots 3| and the sockets38.

The female section of the coupling as will be seen from Figure 1 iscomposed of two parts, in-

cluding a main body section 25 and a hollow end plug 26 which isthreaded into the casing 25 for clamping the washer 22 in position andagainst a retaining ring 21 which is in turn sup ported on an annularshoulder 5| formed in the central bore of the section 25. As will beunderstood, the guide slots 3|, the shoulder 31, and the retainingsockets 38 are all provided in the section 25 of the coupler. 1 It is,therefore, with this part of the coupler which the present invention isprincipally concerned. Preparatory to the formation of the grooves andsockets 3| and 38 in this section, the same as first drilled axiallythrough the member from the outer end thereof with a drill diameterslightly larger than the end M of the cooperating coupling section. Thebore thus drilled is then reamed from the sameend to define the shoulder:31 and the shoulder 5| and the outer end of the bore is then threadedfor receipt of the external threads on the member 26.

As above mentioned, the tool of the present invention is used to formthe aforesaid grooves and sockets and in brief operates to punch fromthe reduced bore portion of the section 25 between the shoulder 31 andthe end M5, the grooves 33 While supporting the inner Wall of the bore,and then to depress the sockets 38 while supporting both the side wallsof the bore and the walls of the grooves 3|. The tool 53, which isillustrated in detail in Figures 3, 4, and 5, comprises a cylindricalbody portion which is arranged to slidably engage in the bore of thefemale section 25 and support the side Walls thereof during thepunching'operation'and is its periphery with 'a plurality of offsetrectangular projections 54 which are ardiate the projections 54 on thework support 63 ranged on the forceful movement of the tool through thebore to engage the shoulder 31 and shear from the reduced bore portionaforesaid the grooves 3|. Provided also on the periphery of the bodyportion 53 of the tool and intermeare a plurality of offset rectangularprojections 55 which serve to engage the shoulder 31 and depress thesockets 38 therein after the grooves 3| have been sheared from the sidewalls of the bore Preferably the sockets are formed after the formationof the grooves and to this end the projections 55 are spacedlongitudinally from the projections 54 so that their operation will beretarded from that of the projections 54. It is important during thepressing of the recesses 38 due to the tremendous strain to which themetal of the coupling section is subjected, to support the side walls ofthe slots 3| and to hold the same against partial closing or otherdistortion. For this purpose the-projections 54 are extendedlongitudinally along the body portion of the tool a distance at leastequal to the length of the grooves 3| so that after the forming of thesegrooves the projections 54 will lie snugly therein and hold the sidewalls thereof against closing or other distortion due to the stressincurred by the pressing out of the sockets 38.

Preferably the tool is reduced somewhat in cross sectional area adjacentits end 10 so..as to allow for a small flow of metal towards the centerof the bore between the shoulder 31 and the end l6 of the section andthereby relieve somewhat the stress on the guide grooves. This reductionin size of the tool is here effected at opposite sides H of the toolwhich are flattened from adjacent the outer end 10 to the projections54. After the pressing operation, the bore of the section is preferablyreamed and the end |6 counterbored such as by means of a reamer 59indicated in Figure 6, to remove any bur or distortion caused by thepunching out of the grooves and sockets.

As indicated in Figures 3 and 5 the tool maybe sup-ported at an end 6|in an ordinary punch press 62 and the coupling section 25 positioned ofthe press withina guard 64 for holdingthe section. against war drawalwith the tool. It will be noted that when the tool is inserted in thesection to its'farther most position as illustrated in Figure 5 the'free end 10 of the tool extends from the end [6, of the section for adistance substantially equal to the depth of the sockets 38depressed'bythe projections 55. 54 used for forming the guide slots willbe passed substantially entirely through the length of the section priorto the engagementof the projections 55 with the shoulder 31. Thus, atthe time the section is subjected to the stress caused by the formationof the sockets, the 'guide' slots will be substantially entirely formedand filled and supported by the'projections 55.

We claim:

1. For use in forming a coupling section having a bore therethrough withan offset portion to define a shoulder and provided with a grooveopening to the bore and extending from said shoulder to an end of saidsection and arranged for the receipt of a projection on an associatedcoupling section for movement of said projection from said end to behindsaid shoulder and said first section being formed with a socket in saidshoulder for In this manner the pr'ojec ztionjs said groove and socketcomprising a cylindrical body portion arranged to slidably engage in andsupport the walls of said bore, an ofiset on said body portion arrangedon the forced movement of said tool through said bore to punch out saidgroove, and a second ofiset on said body portion spaced longitudinallyfrom said first offset and arranged on the forced movement of said toolaforesaid to engage and impress in said shoulder said socket.

2. For use in forming a coupling section having a bore therethrough andformed with a shoulder extending transversely into said bore and withguide grooves extending along the wall of said bore to said shoulder andwith looking recesses in said shoulder, a, tool for forming said groovesand recesses comprising a body portion arranged to slidably engage andsupport said bore side wall, a pair of offset portions on said bodyportion arranged on the forced movement of the tool through said bore toengage said shoulder and punch out therefrom and from said side Wallsaid grooves, and a second pair of offset portions on said body portionspaced longitudinally from said first offset portions arranged on theforced movement of the tool aforesaid to engage said shoulder anddepress therein said recesses.

3. For use in forming a coupling section having a bore therethrough andformed with a shoulder extending transversely into said bore and withguide grooves extending along the wall of said bore to said shoulder andwith looking recesses in said sho'u lder, a tool for forming saidgrooves and recesses comprising a body portion arranged to slidablyengage and support said bore side wall,

' a pair of offset portions on said body portion arranged on the forcedmovement of the tool through said bore to engage said shoulder and punchout therefrom and from said side wall said grooves, and a second pair ofoffset portions on said body portion spaced longitudinally from saidfirst offset portions arranged on the forced movement of the toolaforesaid to engage said shoulder and depress therein said recesses,said first offset portions being of a length as to lie in and supportthe walls of said grooves during the forming of said recesses.

4. For use in forming a tubular coupling section having a portion of thebore thereof reduced adjacent an end thereof to define a shoulder 5"spaced from said end, a tool for forming a longitudinal guide groove inthe wall of said reduced bore portion from said shoulder to said end andfor forming a locking recess in said shoulder comprising, a body portionarranged to slidably engage and support said bore side wall, an offsetprojection on said body portion arranged on the forced movement of thetool through said bore to engage said shoulder and punched out therefromand from said side wall said groove, and a second offset projection onsaid body portion spaced longitudinally from said first projection andarranged on the forced movement of the tool aforesaid to engage saidshoulder and depressed therein said recesses, said first projectionbeing of a length substantially equal to that of said reduced boreportion so as to lie in and support the wall of said groove during theformation of said recesses.

5. For use in forming a coupling section having a bore therethrough andformed with a shoulder extending transversely into said bore and with aguide groove extending along the wall of said bore to said shoulder andwith a locking recess in said shoulder, a tool for forming said grooveand recess comprising a body portion arranged to slidably engage andsupport said bore side wall, an offset portion on said body portionarranged on the forced movement of the tool through said bore to engagesaid shoulder and punch out therefrom and from said side wall saidgroove, and a second offset portion on said body portion spacedlongitudinally from said first offset portion arranged on the forcedmovement of the tool aforesaid to engage said shoulder and depresstherein said recess.

MALCOLM E. MITCHELL. PETER E. MOR'IENSEN. HAROLD W. FOWLER.

